feat(boss): 事件常量 BOSS_PHASE_CHANGED=29 / BOSS_KILLED=30 + 目录同步

docs/technical/implementation_plan.md

@@ -135,6 +135,8 @@ const SPELL_DROP_PICKUP:     int = 21 # architecture_design.md §5.3：法术掉
 | `19` | `EventID.SETTINGS_CHANGED` | `SETTINGS_CHANGED` | `key: String` | `SettingsManager` | `UIManager`（全局主题/字体重载） |
 | `20` | `EventID.GAME_STATE_CHANGED` | `GAME_STATE_CHANGED` | `prev: int, next: int` | `GameCycleManager` | `UIManager`, `AudioManager` |
 | `21` | `EventID.SPELL_DROP_PICKUP` | `SPELL_DROP_PICKUP` | `spell_id: String, auto_equip: bool` | `DropManager`, `ShopManager` | `UIManager`, `PlayerManager` |
+| `29` | `EventID.BOSS_PHASE_CHANGED` | `BOSS_PHASE_CHANGED` | `boss_id, boss_type, phase` | `BossManager` | `UIManager`（HUD 阶段提示） |
+| `30` | `EventID.BOSS_KILLED` | `BOSS_KILLED` | `boss_id, boss_type, wave` | `BossManager` | `GameCycleManager`（结算）, `AchievementManager`（成就） |
 > 新增事件从 **22** 起递增，并向下表登记。规则：编号永不重用（可标 DEPRECATED 但不删除）。
 
 > **E-N2 跨语言边界协议（GDScript ↔ C#）**：`architecture_design.md §6` 规定跨语言只传基本类型（int/float/Vector2/Godot.Array）。`DamageContext`（RefCounted）**不得直接穿越语言边界**。约定如下：

scripts/autoloads/event_ids.gd

@@ -46,4 +46,8 @@ const BULLET_HIT:            int = 26  # 负载：{bullet_id, target_id, hit_pos
 # ── S5 新增事件 (27+) ─────────────────────────────────────────────
 const MINION_SPAWNED:        int = 27  # 负载：{minion_id, owner_id, current_count}
 const MINION_EXPIRED:        int = 28  # 负载：{minion_id, owner_id, current_count}
+
+# ── S6 Boss 事件 (29+) ────────────────────────────────────────────
+const BOSS_PHASE_CHANGED:    int = 29  # 负载：{boss_id, boss_type, phase}
+const BOSS_KILLED:           int = 30  # 负载：{boss_id, boss_type, wave}
 # 每新增一条须同步更新 implementation_plan.md §2.1 事件目录表